#555DB0
Closest named color: Iris (#6258C4). oklch(51.3% 0.13 276.6), rgb(85, 93, 176).
Aa
White text reads best on this color (5.86:1).
About this color
#555DB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.130 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.040 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.57:1 |
| White text | 5.86:1 |
Values
| HEX | #555DB0 |
| RGB | rgb(85, 93, 176) |
| HSL | hsl(235, 37%, 51%) |
| OKLCH | oklch(51.3% 0.13 276.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #555DB0 | 5.86:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #555DB0 | 3.57:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #555DB0 text on white | 5.86:1 | AA | Lc 79.2 | Fine for body text |
| #555DB0 text on black | 3.57:1 | AA large text | Lc -22.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D3D8F1
oklch(88.6% 0.035 276.7)
-
Step 300
300
#B5BEEA
oklch(80.9% 0.063 275.9)
-
Step 400
400
#909BDF
oklch(70.7% 0.1 276.5)
-
Step 500
500
#7681D6
oklch(63.2% 0.128 276.5)
-
Step 600
600
#6068C3
oklch(55.5% 0.14 277)
-
Step 700
700 (this color)
#555DB0
oklch(51.3% 0.13 276.6)
-
Step 800
800
#414789
oklch(42.7% 0.108 276.9)
-
Step 900
900
#373C6D
oklch(37.7% 0.083 277.2)
-
Step 950
950
#202440
oklch(27.1% 0.052 276.2)
#555DB0 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #3868B3 | 0.041 |
| Deuteranopia (no green cones) | #2F61AE | 0.043 |
| Tritanopia (no blue cones) | #2F6F7E | 0.114 |
| Achromatopsia (no color) | #656565 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555DB0
#555DB0
oklch(51.3% 0.13 276.6)
- #796600
#796600
oklch(51.3% 0.106 96.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #555DB0, closest first.
No curated palette has a color within ΔE 0.04 of #555DB0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.040
- French Blue #436BAD ΔE 0.042
- Dusky Blue #475F94 ΔE 0.051
- Mid Blue #276AB3 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.060
- Light Indigo #6D5ACF ΔE 0.061
Use #555DB0 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.